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70a7dcda3f
Fix mbedtls_mpi_mul_mpi() when one of the operands is zero and the
other is negative. The sign of the result must be 1, since some
library functions do not treat {-1, 0, NULL} or {-1, n, {0}} as
representing the value 0.
Signed-off-by: Gilles Peskine <Gilles.Peskine@arm.com>
8 lines
421 B
Plaintext
8 lines
421 B
Plaintext
Bugfix
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* Fix some cases in the bignum module where the library constructed an
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unintended representation of the value 0 which was not processed
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correctly by some bignum operations. This could happen when
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mbedtls_mpi_read_string() was called on "-0", or when
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mbedtls_mpi_mul_mpi() and mbedtls_mpi_mul_int() was called with one of
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the arguments being negative and the other being 0. Fixes #4643.
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